Metal-pot mechanism of casting-machines.



No. 629,459. Patented July 25, I899.

(Application filed Dec. 10, 1898.) (No Model.)

Wifnessa w W J777/67Li076, 1 .93 flaw 10 21422 QAQAWM QDQINQAAQ f Ww QMUNITED STATES PATENT I BERNE NADALL AND MARK BARR, OF BROADHEATH,ENGLAND, ASSIGN-ORS TO THE MERGENTHALER LINOTYPE COMPANY, OF NEW YORK,N. Y.

METAL-POT MECHANISM OF CASTING-MACHINES SPECIFIG ATION forming part ofLetters Patent No. 629,459, dated July 25, 1899.

Application filed December 10,1898. Serial No. 698,849. (No model.)

To all whom it may concern Be it known that we, BERNE NADALL, a citizenof the United States of America, and MARK BARR, a subject of the Queenof Great Britain and Ireland, residing at Broadheath, in the county ofChester, England, have invented certain new and useful Improvements inthe Metal-Pot Mechanism of Casting-Machines; and we do hereby declarethe following to be to a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

The present invention relates to improve- 1 5 ments in the metal-potmechanism of castingmachines in which the injection of the metal iseffected by a body of compressed air instead of by a piston. It isespecially applicable to the casting mechanism of linotype-machines.

Referring to the accompanying drawings, Figure l is a sectionalelevation showing the mechanism in the act of ejecting metal. Fig.

2 is a sectional elevation of a modification, and Fig. 3 is a sectiontaken along the line 3 3 of Fig. 2. v

' Referring to Fig. 1, V is a chamber kept charged by any suitable meanswith air through a supply-pipe V The air is maintained at a suitablepressurein that cham- 0 her, any increase beyond the desired degreebeing prevented by a safety-valve V V is a delivery-pipe leading fromthe air- I chamber V to the cylinder V of the metalpot V. The top of thelatter is open to the air.

V is a three-way cock in the pipe V adapted to open and shut it and toalso establish at stated intervals a connection between the cylinder Vand the open air through an exhaustport'V.

The path of the metal from the cylinder V to the delivery-nozzle 11 isthrough a throat 12 and a port V The said throat starts from the bottomof the cylinder V and rises up to nearly the top of the metal-pot side,where it is closed across its top, as shown. 7 The port V extends fromthe said top of the throat n to the nozzle and is preferably conical incross-sectiom'its diameter diminishing in the direction of the nozzle.It is cohtrolled by a correspondingly-shaped spindle-valve V adapted towork to and fro in a suitable guide V". There is combined with the saidport V and spindle V a second port V situated in the side of the throatv and axially coincident with the conical port V and a valve V likewiseon the spindle V and adapted to control the said port V. The two valvesV and V are so positioned with reference to each other that when one ofthe two ports V V is open the other one is shut. Further, the cock Valready described, is so connected with the pair of valves V and V thatwhen the port V is open the pipe V is also open and that when the port Vis openthe pipe V is shut and the cylinder V is open to the air throughthe port V The connection illustrated consists of a half-crank V fast onthe plug of the cock V, a bar bar V and a pin V passed through both theforked end V and the slot V and which latter is Wide enough to allow ofthe slotted portion of the bar V to move freely to and fro over it.

The respective levels of the metal in the metal-pot V and in thecylinder V clearly indicate the expelling action of the compressed airupon the metal in the latter. The bar V is worked to and fro by anysuitable means. The drawings show it at the end of its motion to theright hand, which motion has shut the port V and opened the pipe V byturning the cock V through an arc of ninety degrees. During the greaterpart of that motion the slot V was sliding over the stud V but the 7closed left-hand end of that slot engaged the pin V just before themotion ceased and so closed the port V and opened the port V Metal isnext ejected by the air-pressure above it in the cylinder V through thenozzle n so long as the port V remains open. To stop ejection, the bar Vis moved back into its original position, closing the pipe V opening theport V and sliding the slot V over the stud V The right-hand end of thatslot engages the pinv V closes the port V, and opens the port V at thesame moment that the cock V completes the closure of the pipe V, so thatall the metal assumes one and the same level in the cylinder V in themetalpot V around it, and in the throat r According to the modificationillustrated in Figs. 2 and 3 the two valves V V are replaced by adiaphragm-valve V reciprocating about its axis in a chamber V. Thelefthand edge V and the chamber are concenand throat v are allillustrated as near the bottom of the metal-pot V instead of near thetop, the throat n being horizontal for that purpose instead of upwardlybent, as in Fig. 1; but this change of position does not affect thepresentinvention and is only to facilitate the molding and casting ofthe pot V, the chamber V, and the throat 11 The connection between thethree-way cock V and the exhaust-port V on the one hand and thediaphragm-valve V on the other consists of a bar V, a lever V fast onthe plug of the cock V and pivotally connected by one arm to the bar V,and a lever V fast by one end to the axle V of the diaphragmvalve V andpivotally connected by its opposite end to one end of a link V, whichhas its opposite'end pivotally connected to the other arm of the leverV". The parts are shown in the metal-ejecting position, the motion ofthe bar V to the left hand having opened the delivery-pipe V shut theexhaust-port V, and moved the end V of the diaphragm-valve V down overthe port V thereby shutting it. To stop the ejection of metal, the bar Vis moved to the right, thereby opening the exhaust-port V shutting thedelivery-pipe V reversing the-diaphragmval've, whereby the end Vgradually leaves the chamber side and the opposite end V comes incontact with it to shut the port V We claim 1. The combination with themetal-pot of a casting mechanism of compressed-air chamber; cylinder;deli"ery-pipe between the two; exhaust-port on the said pipe to the openair and three-way cock controlling the said delivery-pipe and port;throat or a chamber communicating with the said cylinder; port from saidthroat or chamber to the nozzle; port from the metal-pot to the saidthroat or chamber and valve adapted to control the two last-mentionedports and a connection between the said cock and exhaust-port on the onehand and the device for controlling the throat or chamber ports on theother, adapted to keep the delivery-pipe and port and port to nozzleopen and the exhaust-port and the port from the metal-pot closed andvice versa.

2. The combination with the metal-pot of a casting mechanism ,ofcompressed-air chamber; cylinder; delivery-pipe between the two;exhaust-port from the said pipe to the open air; three-way cockcontrolling the said deliverypipe and port; throat from the cylinder tothe nozzle; port between the throat and the said nozzle; port betweenthe throat and the metal-pot; valves adapted to control the said portsrespectively; and a connection between the three-way cock and the portto the open air on the one hand and the said valves on the other,adapted to keep the delivery-pipe and port from throat to nozzle openand the exhaust-port and the port be-' tween the throat and themetal-pot closed and vice versa.

The hereinbefore-described combination of diaphragm-valve andvalve-chamber, the ends of the diaphragm being worked in arcs eccentricto the valve-chamber, their eccentricity increasing in the oppositedirection to that in which they respectively approach the side of thesaid chamber.

4. In a linotype-machine, the combination of the following elements: Ametal-pot having a throat through which the metal is delivered; a valvecontrolling the delivery of metal from the body of the pot into saidthroat; means for delivering air under pressure into the throat to expelthe metal; a valve controlling the admission of said air, andconnections whereby said valves are operated to permit the admission ofmetal and air to the throat alternately, whereby the throat isalternately filled and emptied.

5. In a linotype-machine, a melting-pot having a throat for the deliveryof the metal therefrom and an opening for the admission of molten metalfrom the body of the pot into the throat, and a valve acting to closesaid throat and opening alternately.

6. In a linotype-machine, a melting-pot provided with a throat for thedelivery of molten metal therefrom, a valve for the admission of moltenmetal to said throat, and means for admitting compressed air to expelthe metal, said elements constructed and arranged to operatesubstantially as described and shown.

In testimony that we claim the foregoing as our joint invention we havesigned our names in presence of two subscribing witnesses.

BERNE NADALL. MARK BARR.

Vitnesses: V

JOHN L. WoRrHINeToN, WILLIAM H. BURLING.

